Process for recovery and reuse of textile size

Claim 2

A process for recovery of a warp size from a woven cloth sized with an interpolymer or an alkali metal salt of an interpolymer of a vinyl ester and an αβ-unsaturated acid which comprises: A. desizing the cloth by contacting it with an aqueous scouring solvent containing from 0 to 400 milliequivalents of an alkali metal hydroxide or carbonate per 100 parts by weight of interpolymer at a temperature of 45° to 100°C. to yield a desize liquor of pH in the range of 6 to 10, containing from 0.70 to 7.5 parts by weight of the interpolymer per 100 parts by weight of the desize liquor, B. adding alkali metal ion to the desize liquor to provide a total concentration from 125 to 600 milliequivalents per 100 g. of interpolymer, C. adding an acid of pK a at least 4.8 and a water solubility of at least 20 parts by weight per hundred parts of water, to the desize liquor at a temperature in the range of 40°-90°C. to reduce the pH of the desize liquor to from 1 to 3, thereby precipitating the interpolymer, and D. isolating the precipitated interpolymer from the supernatant solution, wherein the interpolymer comprises 90 to 97 parts by weight of a vinyl ester containing 4 to 7 carbon atoms and 3 to 10 parts by weight of an α,β-unsaturated acid selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, isocrotonic acid, and the monoalkyl esters of maleic acid, fumaric acid, citraconic acid, and itaconic acid in which the alkyl group contains from 1 to 4 carbon atoms and the specific viscosity of the interpolymer is in the range from 1.2 to 12, determined in a dimethyl sulfoxide solution containing 1 gram of

Claim 3

The process of claim 1 wherein the interpolymer comprises between 93 to 96 parts by weight of a vinyl ester containing from 4 to 7 carbon atoms and between 4 and 7 parts by weight of the α,β-unsaturated

Claim 4

The process of claim 1 wherein the desize liquor contains between 1.5 and 4.5 parts by weight of size per 100 parts by weight of desize liquor

Claim 5

The process of claim 1 wherein the alkali metal salt of the interpolymer is selected from the group consisting of the lithium, sodium, and

Claim 6

The process of claim 1 wherein alkali metal salt of the interpolymer is

Claim 7

The process of claim 1 wherein the aqueous solvent is water or an aqueous solution of an alkali metal hydroxide or carbonate of normality in

Claim 8

The process of claim 7 wherein the alkali metal is lithium, sodium or

Claim 9

The process of claim 1 wherein the alkali metal ion of step (B) is provided by addition of lithium, sodium or potassium hydroxide, carbonate

Claim 10

The process of claim 10 wherein the water soluble salt is a chloride, bromide, nitrate, sulfate, phosphate, acetate, formate, propionate,

Claim 11

The process of claim 1 wherein the alkali metal ion concentration is in

Claim 12

The process of claim 1 wherein the acid of step (C) is selected from the group consisting of hydrochloric acid, nitric acid, sulfuric acid, hydrobromic acid, phosphoric acid, acetic acid, propionic acid, butyric

Claim 13

The process of claim 13 wherein the acid is a mineral acid selected from the group consisting of hydrochloric acid, nitric acid and sulfuric

Claim 14

A process for recovery of a warp size from a woven cloth sized with an interpolymer or a sodium salt of an interpolymer containing from 90 to 97 parts by weight of a C 4 to C 7 vinyl ester and 3 to 10 parts by weight of an α,β-unsaturated acid selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, isocrotonic acid, and the monoalkyl esters of maleic acid, fumaric acid, citraconic acid and itaconic acid in which the alkyl group contains from 1 to 4 carbon atoms, which comprises: A. desizing the cloth with an aqueous scouring solution containing from 0 to 400 milliequivalents of sodium hydroxide or carbonate per 100 parts by weight of interpolymer at a temperature of 45° to 100°C. to yield a desize liquor of pH in the range of 7 to 9, containing from 0.70 to 7.5 parts by weight of the interpolymer per 100 parts by weight of the desize liquor, B. adding sodium hydroxide, sodium chloride, sodium nitrate or sodium sulfate to the desize liquor to provide a total sodium ion concentration from 150 to 400 milliequivalents per 100 g. of interpolymer, C. adding an aqueous solution of an acid selected from the group consisting of hydrochloric acid, nitric acid and sulfuric acid to the desize liquor at a temperature in the range of 50° to 80°C. to reduce the pH of the desize liquor to from 1 to 3, thereby precipitating the interpolymer, and D. isolating the precipitated interpolymer from the supernatant solution, wherein the specific viscosity of the interpolymer is in the range from 1.2 to 12, determined in a dimethylsulfoxide solution containing 1 gram of

Claim 15

A process for recovery of a warp size from a woven cloth sized with an interpolymer or a sodium salt of an interpolymer containing from 90 to 97 parts by weight of a C 4 to C 7 vinyl ester and 3 to 10 parts by weight of an α,β-unsaturated acid selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, isocrotonic acid, and the monoalkyl esters of maleic acid, fumaric acid, citraconic acid and itaconic acid in which the alkyl group contains from 1 to 4 carbon atoms, which comprises: A. desizing the cloth with an aqueous scouring solution containing from 0 to 400 milliequivalents of sodium hydroxide or carbonate per 100 parts by weight of interpolymer at a temperature of 45° to 100°C. to yield a desize liquor of pH in the range of 7 to 9, containing from 0.70 to 7.5 parts by weight of the interpolymer per 100 parts by weight of the desize liquor, B. adding sodium hydroxide, sodium chloride, sodium nitrate or sodium sulfate to the desize liquor to provide a total sodium ion concentration from 150 to 400 milliequivalents per 100 g. of interpolymer, C. adding an aqueous solution of an acid selected from the group consisting of hydrochloric acid, nitric acid and sulfuric acid to the desize liquor at a temperature in the range of 50° to 80°C. to reduce the pH of the desize liquor to from 1 to 3, thereby precipitating the interpolymer, and D. isolating the precipitated interpolymer from the supernatant solution, wherein the specific viscosity of the interpolymer is in the range from 1.2 to 12, determined in a dimethylsulfoxide solution containing 1 gram of

Claim 16

A process for recovery and reuse of a warp size which comprises: A. desizing a woven cloth sized with an interpolymer or an alkali metal salt of an interpolymer of a vinyl ester and an α,β-unsaturated acid, by contacting the woven cloth with an aqueous scouring solvent containing from 0 to 400 milliequivalents of alkali metal hydroxide or carbonate per 100 parts by weight of interpolymer at a temperature of 45° to 100°C. to yield a desize liquor of pH less than 10, containing from 0.70 to 7.5 parts by weight of the interpolymer per 100 parts by weight of the desize liquor, B. adding alkali metal ion to the desize liquor to provide a total concentration from 125 to 600 milliequivalents per 100 g. of interpolymer, C. adding an acid of pK a at least 4.8 and a water solubility of at least 20 parts by weight per hundred parts of water, to the desize liquor at a temperature in the range of 40° to 90°C. to reduce the pH of the desize liquor to from 1 to 3, thereby precipitating the interpolymer, D. isolating the precipitated interpolymer from the supernatant solution, E. dissolving the isolated interpolymer in a dilute solution of an aqueous base selected from the group consisting of alkali metal hydroxides and carbonates and ammonium hydroxide to form a sizing solution of pH in the range 6 to 10 containing between 1 and 25 parts of polymer per 100 parts of solution; and F. applying the sizing solution to a textile warp yarn, wherein the interpolymer comprises 90 to 97 parts by weight of a vinyl ester containing 4 to 7 carbon atoms and 3 to 10 parts by weight of an α,β-unsaturated acid selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, isocrotonic acid, and the monoalkyl esters of maleic acid, fumaric acid, citraconic acid, and itaconic acid in which the alkyl group contains from 1 to 4 carbon atoms and the specific viscosity of the interpolymer is in the range from 1.2 to 12, determined in a dimethyl sulfoxide solution containing 1 gram of

Claim 17

A process for recovery and reuse of a warp size which comprises: A. desizing a woven cloth sized with an interpolymer or an alkali metal salt of an interpolymer of a vinyl ester and an α,β-unsaturated acid, by contacting the woven cloth with an aqueous scouring solvent containing from 0 to 400 milliequivalents of alkali metal hydroxide or carbonate per 100 parts by weight of interpolymer at a temperature of 45° to 100°C. to yield a desize liquor of pH less than 10, containing from 0.70 to 7.5 parts by weight of the interpolymer per 100 parts by weight of the desize liquor, B. adding alkali metal ion to the desize liquor to provide a total concentration from 125 to 600 milliequivalents per 100 g. of interpolymer, C. adding an acid of pK a at least 4.8 and a water solubility of at least 20 parts by weight per hundred parts of water, to the desize liquor at a temperature in the range of 40° to 90°C. to reduce the pH of the desize liquor to from 1 to 3, thereby precipitating the interpolymer, D. isolating the precipitated interpolymer from the supernatant solution, E. dissolving the isolated interpolymer in a dilute solution of an aqueous base selected from the group consisting of alkali metal hydroxides and carbonates and ammonium hydroxide to form a sizing solution of pH in the range 6 to 10 containing between 1 and 25 parts of polymer per 100 parts of solution; and F. applying the sizing solution to a textile warp yarn, wherein the interpolymer comprises 90 to 97 parts by weight of a vinyl ester containing 4 to 7 carbon atoms and 3 to 10 parts by weight of an α,β-unsaturated acid selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, isocrotonic acid, and the monoalkyl esters of maleic acid, fumaric acid, citraconic acid, and itaconic acid in which the alkyl group contains from 1 to 4 carbon atoms and the specific viscosity of the interpolymer is in the range from 1.2 to 12, determined in a dimethyl sulfoxide solution containing 1 gram of

Claim 18

The process of claim 16 wherein the interpolymer comprises between 93 to 96 parts by weight of a vinyl ester containing from 4 to 7 carbon atoms and between 4 and 7 parts by weight of the α,β-unsaturated

Claim 19

The process of claim 16 wherein the desize liquor contains between 1.5 and 4.5 parts by weight of size per 100 parts by weight of desize liquor

Claim 20

The process of claim 16 wherein the alkali metal salt of the interpolymer is selected from the group consisting of the lithium, sodium,

Claim 21

The process of claim 16 wherein the alkali metal salt of the

Claim 22

The process of claim 16 wherein the aqueous solvent is water or an aqueous solution of an alkali metal hydroxide or carbonate of normality in

Claim 23

The process of claim 16 wherein the alkali metal is lithium, sodium or

Claim 24

The process of claim 16 wherein the alkali metal ion of step (B) is provided by addition of lithium, sodium or potassium hydroxide, carbonate

Claim 25

The process of claim 25 wherein the water soluble salt is chloride, bromide, nitrate, sulfate, phosphate, acetate, formate, propionate,

Claim 26

The process of claim 16 wherein the alkali metal ion concentration is in the range of 150 to 400 milliequivalents per 100 g. of interpolymer.

Claim 27

The process of claim 16 wherein the acid of step (C) is selected from the group consisting of hydrochloric acid, nitric acid, sulfuric acidm hydrobromic acid, phosphoric acid, acetic acid, propionic acid, butyric

Claim 28

The process of claim 14 wherein the acid is a mineral acid selected from the group consisting of hydrochloric acid, nitric acid and sulfuric

Claim 29

The process of claim 16 wherein the textile warp yarn is selected from the group consisting of acetate filament, polyester filament, rayon filament, nylon filament and poly(acrylonitrile) filament and the texturized yarns obtained by drawing and crimping these filaments; spun polyester, spun cotton, spun rayon, spun nylon, spun acetate, spun wool

Claim 30

A process for recovery and reuse of a warp size which comprises: A. desizing a woven cloth sized with an interpolymer or an alkali metal salt of an interpolymer of a vinyl ester and an α,β-unsaturated acid, by contacting the woven cloth with an aqueous scouring solution containing from 0 to 400 milliequivalents of sodium hydroxide per 100 parts by weight of interpolymer at a temperature of 45° to 100°C. to yield a desize liquor of pH in the range 7 to 9, containing from 0.70 to 7.5 parts by weight of the interpolymer per 100 parts by weight of the desize liquor, B. adding sodium hydroxide, sodium chloride, sodium nitrate or sodium sulfate to the desize liquor to provide a total sodium ion concentration from 150 to 400 milliequivalents per 100 g. of interpolymer, C. adding an aqueous solution of an acid selected from the group consisting of hydrochloric acid, nitric acid and sulfuric acid to the desize liquor at a temperature in the range of 50° to 80°C. to reduce the pH of the size solution to from 1 to 3, thereby precipitating the interpolymer, D. isolating the precipitated interpolymer from the supernatant solution, E. dissolving the isolated interpolymer in a dilute solution of an aqueous base selected from the group consisting of alkali metal hydroxides and carbonates and ammonium hydroxide to form a sizing solution of pH in the range 7 to 9 containing from 1 to 25 parts of polymer per 100 parts of solution, and F. applying the sizing solution to a textile warp yarn, wherein the interpolymer comprises 90 to 97 parts by weight of a vinyl ester containing 4 to 7 carbon atoms and 3 to 10 parts by weight of an α,β-unsaturated acid selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, isocrotonic acid, and the monoalkyl esters of maleic acid, fumaric acid, citraconic acid, and itaconic acid in which the alkyl group contains from 1 to 4 carbon atoms and the specific viscosity of the interpolymer is in the range from 1.2 to 12, determined in a dimethyl sulfoxide solution containing 1 gram of interpolymer per 100 ml of solution a 25°C.

Claim 31

A process for recovery and reuse of a warp size which comprises: A. desizing a woven cloth sized with an interpolymer or an alkali metal salt of an interpolymer of a vinyl ester and an α,β-unsaturated acid, by contacting the woven cloth with an aqueous scouring solution containing from 0 to 400 milliequivalents of sodium hydroxide per 100 parts by weight of interpolymer at a temperature of 45° to 100°C. to yield a desize liquor of pH in the range 7 to 9, containing from 0.70 to 7.5 parts by weight of the interpolymer per 100 parts by weight of the desize liquor, B. adding sodium hydroxide, sodium chloride, sodium nitrate or sodium sulfate to the desize liquor to provide a total sodium ion concentration from 150 to 400 milliequivalents per 100 g. of interpolymer, C. adding an aqueous solution of an acid selected from the group consisting of hydrochloric acid, nitric acid and sulfuric acid to the desize liquor at a temperature in the range of 50° to 80°C. to reduce the pH of the size solution to from 1 to 3, thereby precipitating the interpolymer, D. isolating the precipitated interpolymer from the supernatant solution, E. dissolving the isolated interpolymer in a dilute solution of an aqueous base selected from the group consisting of alkali metal hydroxides and carbonates and ammonium hydroxide to form a sizing solution of pH in the range 7 to 9 containing from 1 to 25 parts of polymer per 100 parts of solution, and F. applying the sizing solution to a textile warp yarn, wherein the interpolymer comprises 90 to 97 parts by weight of a vinyl ester containing 4 to 7 carbon atoms and 3 to 10 parts by weight of an α,β-unsaturated acid selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, isocrotonic acid, and the monoalkyl esters of maleic acid, fumaric acid, citraconic acid, and itaconic acid in which the alkyl group contains from 1 to 4 carbon atoms and the specific viscosity of the interpolymer is in the range from 1.2 to 12, determined in a dimethyl sulfoxide solution containing 1 gram of interpolymer per 100 ml of solution a 25°C.